Malicious PDF — malware analysis report

Static analysis result for SHA-256 036d32b36bb6e33b…

MALICIOUS

PDF

96.1 KB Created: 2021-06-26 06:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 785895d78a4c65e30f50c176c25cd697 SHA-1: c89a825d29181a65b30c8d44fe2fc47a381c5450 SHA-256: 036d32b36bb6e33b39c5ad46aa8a4f2fc0067e6febf999e9443aee5be884310f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing or trojan. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1a1a4f39---bamozisadojutobidu.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34489917f81e8cb51784f5991b6fb961/26986730121.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dokavixed.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609202c41258c---55409452091.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/zaruxokomemi.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/wogezovujevuj.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b35784a9888---kujekiwokikilevob.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/gigutezamo.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/85885616070.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/xitixulek.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uoq4d9ci6v48okmi3ij86bh8de/bitukavepujomagusigo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/42993697999.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7ebb6f04d23a29ed9f670b53708daba/potidu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tojenep.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3799b6cce1---kasiban.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160992e4e77336---farirasejifajipoxevalo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/65b4c35f3dea267abf68b9474ca633d6/88327677349.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/50596854873.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/sataku.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/pupim.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a3773289---3509552537.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39061019256.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/tazop.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072b352de5d8---misaribupanuvapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4+in+chinese+characterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 9132 bytes
SHA-256: 4f6e712a7dd0d024e0e20e0697c3eb5ccdc5a60a99084b7eb58766fa98c19d6e
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10144 bytes
SHA-256: 4deda1e5afc61e5faa8443f2762f2aabfc7db256f8d26901bd14aabf92b28d48
font_02_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 18892 bytes
SHA-256: 7b02c59cb26f05197d1be83af803f1a7d4bbea962842bda6d10b8876a21916cb

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